During which phase of meiosis does crossing over occur? (a)metaphase i (b)metaphase ii (c)prophase i (d)prophase ii

C: Prophase 1

Crossing over occurs in the first division of meiosis. Crossing over of chromatid pair occurs in PACHYTENE stage of PROPHASE I.

The crossing over is the exchange of genetic material. The crossing over takes place due to exchnage od DNA segments between non sister chromatids of homologous chromosomes. This results in new allelic combinations in daughter cells.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.